Replace DRV134 with OP-amp

[CJ900RR]

I want to replace the DRV134 with a good sounding OP-amp configuration to use in a BPA-amp. Im not shure if this is the correct way to do it. Please give me advice or circuits that has a good audiophilish sound

I used the OPA2134 in the schematic but other ICs would suit me fine to.

Best regards, Calle...

[AndrewT]

The drv134 is a completely different animal from opa134.
The drv is designed to drive high currents into low impedance loads.
If your circuit took advantage of this ability then replacing with an opa2134 will not work.

[CJ900RR]

Hi Andrew and thank you for your reply. Im in the process of build a bridge/paralell amp simular to BPA300, and im looking for a good balanced line driver.

There is no buffer/preamp on the bpa-board, but there will be a preamp in a seperate housing.

I have 3 DRV134 and could use those, but what I have read on this site is that they doesnt sound to good. But i have no hearing-experiance from them myself.

Any opinion is welcome.

[banana]

We've talked about OPA1632 in an earlier thread. Need some skill to solder it though.

Driver chips for BPA300 amplifier

[CJ900RR]

Nice design banana. Do you have a schematic to go with that

Solder is no problem, i have been working with surface-monted components for 8 years now. That pakage is noting

First machine is my daily toy: http://www.alltronic.se/en/bilder.html

[Juergen Knoop]

Calle,
there is no obvious reason, why your circuit shoudn't work.
Just give it a try.
Regards
Jürgen

[Dalus]

The chip amps that I have (not bpa) like a high drive current at least they sound better when they're driven from my class a preamp.
So I would think you should use a class a mosfet stage after your opamps.

[banana]

Calle, a quick schematic. Power supply and bypass not shown.

I use 4.7K feedback resistor, larger than the datasheet suggested. It's to buy a little lesser load for the preceding stage.

[Minion]

I have used this very simple curcuit for driveing a BPA from a Unballanced audio source...... It also works good as a output line driver for Mic preamps as it can drive a 600 Ohm load......


Cheers

[tiltedhalo]

Why would you want to replace the DRV134 with OPA 134's??
The DRV is cross coupled and designed for driveing ballanced pairs and does so quite well, and by the way the three internal op amps in the DRV are OPA134's so your difference in sound quality will be negligible. but useing an non inverting and inverting unity gain op amps will not perform nearly as well as the DRV. If you are seriously looking for an op amp alternative take a look at ESP's web site he has a circuit based on the DRV design and would allow for the use of High Quality op amps. Also THAT corp. makes a pin for pin replacement for the DRV that useing independant feed back loops that allow for lower distortion and higher drive levels as the output comes close to rail voltage of the op amp.